SLIM: debug output

This patch contains all the necessary pieces to add debugging output to SLIM.

---

 security/slim/slim.h      |   16 +
 security/slim/slm_main.c  |  499 +++++++++++++++++++++++++++++++-----
 security/slim/slm_secfs.c |  117 ++++++++
 3 files changed, 570 insertions(+), 62 deletions(-)

@@ -100,3 +103,19 @@ extern int slm_init_config(void);
 
 extern __init int slm_init_secfs(void);
 extern __exit void slm_cleanup_secfs(void);
+
+extern __init int slm_init_debugfs(void);
+extern __exit void slm_cleanup_debugfs(void);
+
+extern unsigned int slm_debug;
+enum slm_debug_level {
+	SLM_BASE = 1, 
+	SLM_INTEGRITY = 2, 
+	SLM_SECRECY = 4,
+	SLM_VERBOSE = 8,
+};
+
+#undef dprintk
+#define dprintk(level, format, a...) \
+	if (slm_debug & level) \
+		printk(KERN_INFO format, ##a)

		if (mod_reg_security(MY_NAME, &slm_security_ops)) {

+ dprintk(SLM_BASE,
+ "%s: security hooks registration "
+ "failed\n", __FUNCTION__);
slm_cleanup_secfs();
+ slm_cleanup_debugfs();

 			return -EINVAL;
		}

secondary = 1;
}
+ dprintk(SLM_BASE, "%s: registered security hooks\n", __FUNCTION__);
return 0;
}

static void __exit cleanup_slm(void)
{
slm_cleanup_secfs();
- if (secondary)
- mod_unreg_security(MY_NAME, &slm_security_ops);
- else
- unregister_security(&slm_security_ops);
+ slm_cleanup_debugfs();
+ if (secondary) {
+ if (mod_unreg_security(MY_NAME, &slm_security_ops))
+ dprintk(SLM_BASE,
+ "%s: failure unregistering module "
+ "with primary module.\n", __FUNCTION__);
+ } else if (unregister_security(&slm_security_ops)) {
+ dprintk(SLM_BASE,
+ "%s: failure unregistering module "
+ "with the kernel\n", __FUNCTION__);
+ }
+ dprintk(SLM_BASE, "%s: completed \n", __FUNCTION__);
}

module_init(init_slm);
@@ -1525,4 +1897,7 @@ module_exit(cleanup_slm);
module_param(slm_xattr_name, charp, 0444); MODULE_PARM_DESC(slm_xattr_name, "SLIM extended attribute");

+module_param(slm_debug, uint, 1); +MODULE_DESCRIPTION("Simple Linux Integrity Module"); +
MODULE_LICENSE("GPL");